Re: next/master boot bisection: next-20190215 on beaglebone-black

[Dan Williams]

On Thu, Apr 11, 2019 at 1:08 PM Guenter Roeck <groeck@xxxxxxxxxx> wrote:
>
> On Thu, Apr 11, 2019 at 10:35 AM Kees Cook <keescook@xxxxxxxxxxxx> wrote:
> >
> > On Thu, Apr 11, 2019 at 9:42 AM Guenter Roeck <groeck@xxxxxxxxxx> wrote:
> > >
> > > On Thu, Apr 11, 2019 at 9:19 AM Kees Cook <keescook@xxxxxxxxxxxx> wrote:
> > > >
> > > > On Thu, Mar 7, 2019 at 7:43 AM Dan Williams <dan.j.williams@xxxxxxxxx> wrote:
> > > > > I went ahead and acquired one of these boards to see if I can can
> > > > > debug this locally.
> > > >
> > > > Hi! Any progress on this? Might it be possible to unblock this series
> > > > for v5.2 by adding a temporary "not on ARM" flag?
> > > >
> > >
> > > Can someone send me a pointer to the series in question ? I would like
> > > to run it through my testbed.
> >
> > It's already in -mm and linux-next (",mm: shuffle initial free memory
> > to improve memory-side-cache utilization") but it gets enabled with
> > CONFIG_SHUFFLE_PAGE_ALLOCATOR=y (which was made the default briefly in
> > -mm which triggered problems on ARM as was reverted).
> >
>
> Boot tests report
>
> Qemu test results:
>     total: 345 pass: 345 fail: 0
>
> This is on top of next-20190410 with CONFIG_SHUFFLE_PAGE_ALLOCATOR=y
> and the known crashes fixed.

In addition to CONFIG_SHUFFLE_PAGE_ALLOCATOR=y you also need the
kernel command line option "page_alloc.shuffle=1"

...so I doubt you are running with shuffling enabled. Another way to
double check is:

   cat /sys/module/page_alloc/parameters/shuffle